feat: implement user wallet charging and transaction logging for Daya loan processing

src/CMSMicroservice.Application/UserOrderCQ/Commands/SubmitShopBuyOrder/SubmitShopBuyOrderCommandHandler.cs

@@ -10,6 +10,7 @@ public class
 {
     private readonly IApplicationDbContext _context;
     private readonly ILogger<SubmitShopBuyOrderCommandHandler> _logger;
+    private float _vatRate;
 
     public SubmitShopBuyOrderCommandHandler(
         IApplicationDbContext context,
@@ -35,7 +36,7 @@ public class
         // چک موجودی محصولات
         var outOfStockProducts = new List<string>();
         var insufficientStockProducts = new List<(string Title, int Requested, int Available)>();
-        
+
         foreach (var cartItem in user.UserCarts)
         {
             if (cartItem.Product.RemainingCount <= 0)
@@ -44,33 +45,55 @@ public class
             }
             else if (cartItem.Product.RemainingCount < cartItem.Count)
             {
-                insufficientStockProducts.Add((cartItem.Product.Title, cartItem.Count, cartItem.Product.RemainingCount));
+                insufficientStockProducts.Add((cartItem.Product.Title, cartItem.Count,
+                    cartItem.Product.RemainingCount));
             }
         }
-        
+
         if (outOfStockProducts.Any())
         {
             throw new Exception($"محصولات زیر ناموجود شده‌اند: {string.Join("، ", outOfStockProducts)}");
         }
-        
+
         if (insufficientStockProducts.Any())
         {
-            var messages = insufficientStockProducts.Select(p => 
+            var messages = insufficientStockProducts.Select(p =>
                 $"«{p.Title}»: درخواست {p.Requested} عدد، موجودی {p.Available} عدد");
             throw new Exception($"موجودی محصولات زیر کافی نیست: {string.Join(" | ", messages)}");
         }
 
-        if (user.UserCarts.Sum(s => s.Count * s.Product.Price) != request.TotalAmount)
+        long finalAmount = 0;
+        var vatIsEnable =
+            _context.SystemConfigurations
+                           .FirstOrDefault(f => f.Scope == ConfigurationScope.VAT && f.Key == "IsEnabled")?.Value ??
+                       "0";
+        if (vatIsEnable=="1")
+        {
+            _vatRate = float.Parse(
+                _context.SystemConfigurations
+                    .FirstOrDefault(f => f.Scope == ConfigurationScope.VAT && f.Key == "Shop.VAT")?.Value ??
+                throw new InvalidOperationException());
+            finalAmount = AddVAT(user.UserCarts.Sum(s => s.Count * s.Product.Price));
+            _logger.LogInformation(
+                "Calculating final amount with VAT. Base Amount: {BaseAmount}, VAT Rate: {VATRate}, Final Amount: {FinalAmount}",
+                user.UserCarts.Sum(s => s.Count * s.Product.Price), _vatRate, finalAmount);
+        }
+        else
+        {
+            finalAmount = user.UserCarts.Sum(s => s.Count * s.Product.Price);
+        }
+
+        if (finalAmount != request.TotalAmount)
             throw new Exception("مبلغ سفارش با مجموع سبد خرید مطابقت ندارد.");
 
 
         var userWallet = user.UserWallets.FirstOrDefault();
         if (userWallet == null)
             throw new Exception("کیف پول کاربر یافت نشد.");
-        
-        if (userWallet.Balance<=0 || userWallet.Balance<request.TotalAmount)
+
+        if (userWallet.Balance <= 0 || userWallet.Balance < request.TotalAmount)
             throw new Exception("موجودی کیف پول کاربر برای انجام این تراکنش کافی نیست.");
-        
+
         var newTransaction = new Transaction()
         {
             Amount = request.TotalAmount,
@@ -82,18 +105,18 @@ public class
         };
         await _context.Transactions.AddAsync(newTransaction, cancellationToken);
         await _context.SaveChangesAsync(cancellationToken);
-        
+
         var newWalletLog = new UserWalletChangeLog()
         {
             CurrentBalance = userWallet.Balance,
             CurrentNetworkBalance = userWallet.NetworkBalance,
             WalletId = userWallet.Id,
-            ChangeValue = -1*request.TotalAmount,
+            ChangeValue = -1 * request.TotalAmount,
             IsIncrease = false,
             RefrenceId = newTransaction.Id,
         };
         userWallet.Balance -= request.TotalAmount;
-        
+
         await _context.UserWalletChangeLogs.AddAsync(newWalletLog, cancellationToken);
         await _context.SaveChangesAsync(cancellationToken);
 
@@ -111,7 +134,7 @@ public class
         };
         await _context.UserOrders.AddAsync(newOrder, cancellationToken);
         await _context.SaveChangesAsync(cancellationToken);
-        
+
         // محاسبه و ثبت VAT (اگر فعال باشد)
         var vatCreated = await CalculateAndSaveVAT(newOrder.Id, request.TotalAmount, cancellationToken);
         if (vatCreated)
@@ -119,37 +142,43 @@ public class
             newOrder.HasVAT = true;
             await _context.SaveChangesAsync(cancellationToken);
         }
-        
+
         var factorDetailsList = user.UserCarts.Select(s => new FactorDetails()
         {
             ProductId = s.ProductId,
             Count = s.Count,
-            UnitPrice = s.Product.Price,
+            UnitPrice =vatIsEnable=="1" ?AddVAT(s.Product.Price): s.Product.Price,
             OrderId = newOrder.Id
         });
         await _context.FactorDetails.AddRangeAsync(factorDetailsList, cancellationToken);
-        
+
         // کاهش موجودی محصولات و افزایش تعداد فروش
         foreach (var cartItem in user.UserCarts)
         {
             cartItem.Product.RemainingCount -= cartItem.Count;
             cartItem.Product.SaleCount += cartItem.Count;
         }
-        
+
         user.UserCarts.Clear();
         await _context.SaveChangesAsync(cancellationToken);
-        
-        _logger.LogInformation("Order {OrderId} completed. Stock updated for {ProductCount} products.", 
+
+        _logger.LogInformation("Order {OrderId} completed. Stock updated for {ProductCount} products.",
             newOrder.Id, factorDetailsList.Count());
-        
+
         var finalResult = new SubmitShopBuyOrderResponseDto()
         {
             Id = newOrder.Id,
-  
         };
         return finalResult;
     }
 
+    public long CalculateVAT(long amount) => (long)(amount * _vatRate);
+
+    /// <summary>
+    /// محاسبه قیمت با احتساب مالیات
+    /// </summary>
+    public long AddVAT(long amount) => amount + CalculateVAT(amount);
+
     private async Task<bool> CalculateAndSaveVAT(long orderId, long orderAmount, CancellationToken cancellationToken)
     {
         try
@@ -166,7 +195,7 @@ public class
 
             // دریافت نرخ VAT
             var vatRateConfig = await _context.SystemConfigurations
-                .FirstOrDefaultAsync(x => x.Scope == ConfigurationScope.VAT && x.Key == "Rate", cancellationToken);
+                .FirstOrDefaultAsync(x => x.Scope == ConfigurationScope.VAT && x.Key == "Shop.VAT", cancellationToken);
 
             if (vatRateConfig == null || !decimal.TryParse(vatRateConfig.Value, out var vatRate))
             {
@@ -201,7 +230,7 @@ public class
                 vatAmount,
                 totalAmount
             );
-            
+
             return true;
         }
         catch (Exception ex)
@@ -211,4 +240,4 @@ public class
             return false;
         }
     }
-}
+}